Hello dude, are Welcome!!
i Have a Gixxer 750K5 (in my country is k6, but the parts and models in your country is K4-k5), recently i had a problem with ECU with fuel injection mode (when you turn the key on, the fuel pump inject a precious level of fuell to power on, the mine don't make nothing, i have cut the cable and put directly, this work good, but i don't press start botton quickly they alert on pannel with f1 code!
I just wan't to know, is easy in your country to found de ECU module for GSX-R750 k4? And another question, have you tryed put the ECU GSX-R600 on GSX-R7500 (same model, GSX-R600 k5 on GSX-R750 K5)?
Thanks!!